Part 1 day 12
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a85fb88c09
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@ -1,13 +1,31 @@
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import streams, sequtils
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import streams, sequtils, strutils, tables
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type Dir = enum north, east, south, west
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proc left(
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proc left(d: Dir, n = 1): Dir = Dir((ord(d) - n) %% 4)
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proc right(d: Dir, n = 1): Dir = Dir((ord(d) + n) %% 4)
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const dirMap = {north: (0, -1), east: (1, 0), south: (0, 1), west: (-1, 0)}.toTable
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proc move(pos: (int, int), nvel: (int, int), mag: int): (int, int) =
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((pos[0] + (nvel[0] * mag)), (pos[1] + (nvel[1] * mag)))
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proc part1*(s: Stream): int =
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var d = east
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var p = (0, 0)
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for l in s.lines:
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echo l
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9
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let arg = l[1..^1].parseInt
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echo arg
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case l[0]:
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of 'N': p = p.move(dirMap[north], arg)
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of 'S': p = p.move(dirMap[south], arg)
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of 'E': p = p.move(dirMap[east], arg)
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of 'W': p = p.move(dirMap[west], arg)
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of 'L': d = d.left(arg div 90)
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of 'R': d = d.right(arg div 90)
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else: p = p.move(dirMap[d], arg)
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p[0].abs + p[1].abs
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proc part2*(s: Stream): int =
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9
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@ -54,7 +54,7 @@ proc flipped(h: var HandheldState): HandheldState =
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proc altHandheld(h: var HandheldState): Option[HandheldState] =
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case h.bootcode[h.pointer].instruction:
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of acc: return none(HandheldState)
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of jmp, nop: some(h.flipped)
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of jmp, nop: return some(h.flipped)
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proc part2*(s: Stream): int =
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var alts = initTable[int, HandheldState]()
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